David - I totally get using LED light for fatigue. After my treatment, I was going to a gym that offered a "stand up" red light therapy as part of my membership.
I read about it and also asked my doctor. Every time I walked on the treadmill, my body and even my bones were achey. I was afraid it would hurt my liver to use red light therapy.
My doctor approved and said it wouldn't hurt me. I did it for about a month every time I worked out. 2 xs a week. Soon it was springtime, and I was able to walk outside and quit the gym.
I personally think that as a part of eating good, and exercising, the red light made me feel better.
Does your doctor think they're good for you? There are a lot of athletes who use them.
All Best,
Karen